https://www.geekonthepc.com/2016/07/10/guide-make-almost-any-printer-airprint-compatible-with-a-raspberry-pi-in-20-minutes/My wife’s computer is an iPad and she needed to print something. Our printer is an older Brother network laser printer and as such doesn’t support AirPrint. I used this guide to get an Avahi discovery service running on my Raspberry Pi to enable my printer to be discoverable by iOS, iPadOS, and Android.